WO2013154151A1

WO2013154151A1 - Illumination device and liquid crystal display device

Info

Publication number: WO2013154151A1
Application number: PCT/JP2013/060909
Authority: WO
Inventors: 直也遠山; 栗原　誠
Original assignee: 株式会社リキッド・デザイン・システムズ
Priority date: 2012-04-11
Filing date: 2013-04-11
Publication date: 2013-10-17
Also published as: JPWO2013154151A1; KR101986694B1; US20140132891A1; CN103688373A; KR20150009418A; CN103688373B; JP5481626B1; US9159271B2

Abstract

An illumination device has a plurality of LED modules and a driving unit. The LED modules have: a metal base substrate formed in a planar shape; an organic substrate; a plurality of LEDs arranged on the organic substrate; a metal member provided so as to correspond to each of the LEDs, conduct heat from the LED, be electrically connected via a switch element from one of the electrodes of the LEDs, go through the organic substrate along the width direction thereof from the LED mounting surface of the organic substrate, and be exposed from the opposite surface of the organic substrate; LED control signal terminals provided to the edge side of the organic substrate; and voltage feed terminals provided to the edge side of the organic substrate. The LED modules are arranged along the row direction and the column direction so as to be capable of attaching to and detaching from the metal base substrate, the LED control signal terminals and the power feed terminals that are adjacent to each other along the row direction and the column direction being connected to each other. The driving unit drives each of the LEDs arranged on the metal base substrate.

Description

Illumination device and liquid crystal display device

The present invention relates to a lighting device and a liquid crystal display device.

Conventionally, a liquid crystal display device in which a plurality of LED substrates on which LEDs are mounted are arranged side by side on the back side of a liquid crystal panel, can prevent deterioration of maintainability and generation of useless space, A liquid crystal display device that prevents leakage of unnecessary radiation from an LED substrate is disclosed (see Patent Document 1).

The LED substrate of the liquid crystal display device of Patent Document 1 is a relatively small substrate on which a plurality of LEDs, which are light sources for backlights, are mounted, and is arranged side by side on the back side of the liquid crystal panel. It is held (supported) by.

Further, a sheet-like heat transfer member is held between the backlight chassis and the chassis tray. Thereby, the heat generated in the LED substrate is dissipated through the backlight chassis and the chassis tray.

JP 2010-60921 A

However, in the liquid crystal display device of Patent Document 1, in order to electrically connect adjacent LED substrates, it is necessary to provide an inter-substrate connecting member on each back side of the adjacent LED substrates. For this reason, an inter-substrate connecting member is required according to the number of LED substrates, and there is a problem that maintenance of the LEDs becomes complicated.

Also, a sheet-like heat transfer member is provided between the backlight chassis and the chassis tray, which increases the cost.

The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide an illumination device and a liquid crystal display device in which LEDs can be exchanged with a simple operation without cost and labor.

The lighting device according to the present invention is provided in a corresponding manner for each LED, a metal base substrate formed in a planar shape, an organic substrate, a plurality of LEDs arranged on the organic substrate, and the LED Metal member that is electrically connected to the LED from one electrode of the LED via a switch element and is exposed from the opposite surface through the width direction of the organic substrate from the LED mounting surface of the organic substrate. And an LED control signal terminal provided on the edge side of the organic substrate, and a voltage supply terminal provided on the edge side of the organic substrate, and is detachable from the metal base substrate in the row direction. A plurality of LED modules arranged in the column direction and connected to adjacent LED control signal terminals and adjacent power supply terminals between those adjacent in the row direction and the column direction, and arranged on the metal base substrate And a driving unit for driving the respective LED's.
A liquid crystal display device according to the present invention includes a liquid crystal panel in which a plurality of pixels are arranged, and the illumination device that irradiates light to the liquid crystal panel.

According to the present invention, the LEDs can be exchanged with a simple operation without cost and labor.

FIG. 1 is a front view of a backlight device according to an embodiment of the present invention. FIG. 2 is a front view of the aluminum base substrate that appears when the LED modules and the control circuit are removed from the backlight device. FIG. 3 is a perspective view of the LED module on the LED mounting surface side (surface side). FIG. 4 is a perspective view of the opposite side (back side) of the LED mounting surface of the LED module. FIG. 5 is a diagram illustrating a state in which a multilayer substrate is provided on the back side of the LED module. FIG. 6 is a cross-sectional view of the LED module. FIG. 7 is a diagram illustrating a state in which an insulating cover is provided on the back side of the LED module. FIG. 8 is a cross-sectional view of the LED module. FIG. 9 is a cross-sectional view of the LED module and the aluminum base substrate in a state where the circular convex connection portion is fitted in the circular concave portion. FIG. 10A is a diagram illustrating a full-modulation backlight device. FIG. 10B is a diagram illustrating a region-based modulation backlight device. FIG. 10C is a diagram illustrating the backlight device of the present embodiment. FIG. 11 is a block diagram illustrating a functional configuration of a liquid crystal display device using a backlight device. FIG. 12 is a simplified view of an LED module in which LEDs are arranged. FIG. 13 is a simplified view of a backlight device in which LED modules are arranged. FIG. 14 is a diagram illustrating 64 pixels irradiated with light to one LED. FIG. 15 is a diagram illustrating a detailed circuit configuration of the LED module. FIG. 16 is a diagram for explaining the operation of the maximum luminance detection unit. FIG. 17 is a circuit diagram of the LED module of the second embodiment. FIG. 18 is a perspective view of the sensor module. FIG. 19 is a cross-sectional view of the sensor module. FIG. 20 is a circuit diagram of the sensor module. FIG. 21 is a perspective view of the wireless LAN module. FIG. 22 is a cross-sectional view of the wireless LAN module. FIG. 23 is a circuit diagram of the wireless LAN module.

Hereinafter, embodiments of the present invention will be described in detail.
[First Embodiment]
FIG. 1 is a front view of a backlight device 1 according to the first embodiment of the present invention. The backlight device 1 controls driving of a plurality of LED modules 10 in which a plurality of LEDs (Light Emitting Diodes) 22 are mounted and arranged in a row direction and a column direction (matrix shape) and LEDs in the row direction. A control circuit 11 and a control circuit 12 that controls driving of LEDs in the column direction are provided.

In the backlight device 1, as shown in FIG. 1, 96 LED modules 10 are mechanically and electrically connected to an aluminum base substrate 13 described later. The LED module 10 is configured to be detachable from the aluminum base substrate 13. The number of LED modules 10 is not particularly limited.

FIG. 2 is a front view of the aluminum base substrate 13 that appears when the LED modules 10 and the

control circuits

11 and 12 are removed from the backlight device 1 shown in FIG. The aluminum base substrate 13 is formed with circular recesses 13a arranged in the row direction and the column direction. Each circular recess 13a is formed in such a size that a circular convex connection portion 24 (described in detail later) provided in the LED module 10 can be fitted.

The aluminum base substrate 13 is formed in a flat plate shape. The alignment of the aluminum base substrate 13 and each LED module 10 may be performed by simply fitting the circular convex connection portion 24 of the LED module 10 into the circular concave portion 13a of the aluminum base substrate 13.

FIG. 3 is a perspective view of the LED module 10 on the LED mounting surface side (front surface side). The LED module 10 includes an organic substrate 21 formed in a flat plate shape, and one or more (9 in this embodiment) LEDs 22 provided on the organic substrate 21. The vertical and horizontal sizes of the LED module 10 are both assumed to be, for example, 2 inches, but can be appropriately changed according to the size of the backlight device 1.

On the organic substrate 21, nine LEDs 22 are arranged at equal intervals in the row direction and the column direction. In the present embodiment, a case where nine LEDs 22 are provided on the organic substrate 21 will be described. However, the number of LEDs 22 may be 8 or less, or 10 or more, and is not particularly limited. Further, the number of LEDs 22 on the organic substrate 21 is determined according to the luminance of the LEDs 22 alone, the luminance required by the backlight device 1, and the light amount area. The LEDs 22 can be driven independently, and the brightness, light emission time, and light emission timing can be adjusted.

FIG. 4 is a perspective view of the LED module 10 on the opposite side (back side) of the LED mounting surface. The LED module 10 includes, on the back surface side, an electrode aluminum piece 23 connected to one electrode side of the LED 22 shown in FIG. 3, a cylindrical portion 24 provided on the back surface of the organic substrate 21, and each side of the organic substrate 21. And an interface internal terminal 25 provided at the end of the terminal.

The electrode aluminum piece 23 is electrically connected to the negative electrode of the LED 22 via a field effect transistor (FET) and a micro bump 22a (see FIG. 6 described later). Further, the electrode aluminum piece 23 releases the heat from the LED 22 to the outside, and becomes a ground potential when connected to the aluminum base substrate 13 which is a ground potential.
Four cylindrical portions 24 are provided on the back surface of the organic substrate 21. The diameter of the cylindrical portion 24 is formed smaller than the diameter of the circular recess 13a of the aluminum base substrate 13 shown in FIG.

For example, five interface internal terminals 25 are provided at each end of the four sides of the organic substrate 21. The interface internal terminal 25 has an interface function for electrically connecting to the adjacent LED module 10, and has, for example, the role of control line connection, power supply line connection, and spare terminal.

FIG. 5 is a view showing a state in which the multilayer substrate 26 is provided on the back side of the LED module 10 shown in FIG. FIG. 6 is a cross-sectional view of the LED module 10 shown in FIG. As shown in the figure, the organic substrate 21 has a wiring 28. A multilayer substrate 26 having wirings 28 is provided on the back surface of the organic substrate 21. LED22 is connected to the wiring 28 or the electrode aluminum piece 23 through the micro bump 22a.

FIG. 7 is a view showing a state in which an insulating cover 27 is provided on the back side of the LED module 10 shown in FIG. FIG. 8 is a cross-sectional view of the LED module 10 shown in FIG. As shown in FIGS. 7 and 8, the LED module 10 includes an insulating cover 27 whose back side is covered except for the electrode aluminum piece 23, and a plurality of interface external terminals 29. Each interface external terminal 29 is connected to each interface internal terminal 25.

That is, the interface external terminal 29 is connected to the interface contact 25 through the wiring 28 or through the insulating cover 27 as shown in FIG. Thereby, when each LED module 10 is arranged on the aluminum base substrate 13, the adjacent interface external terminals 29 are electrically connected to each other, and the control line, the power source is connected between the LED modules 10 adjacent in the row direction and the column direction. The line is connected.

When the insulating cover 27 is covered with the cylindrical portion 24 shown in FIG. 5, a circular convex connection portion 24a is formed as shown in FIGS. The circular convex connection part 24a is formed in a size that can be fitted into the circular concave part 13a of the aluminum base substrate 13 shown in FIG. The circular convex connecting portion 24a is fitted into the circular concave portion 13a, so that the LED module 10 and the aluminum base substrate 13 can be aligned.

FIG. 9 is a cross-sectional view of the LED module 10 and the aluminum base substrate 13 in a state where the circular convex connecting portion 24a is fitted in the circular concave portion 13a.
When the circular convex connecting portion 24a is fitted into the circular concave portion 13a, the electrode aluminum piece 23 is connected to the aluminum base substrate 13. Thereby, the heat generated in the LED 22 is conducted to the aluminum base substrate 13 through the electrode aluminum piece 23 through the micro bumps 22a. One electrode of the LED 22 is grounded via a field effect transistor (FET) (not shown).

As described above, the backlight device 1 includes the plurality of LED modules 10 that can be attached to and detached from the aluminum base substrate 13. Thereby, even when any LED 22 is damaged, only the LED module 10 including the damaged LED 22 needs to be replaced. Therefore, maintenance of the backlight device 1 is facilitated, and the yield is improved. Moreover, the backlight apparatus 1 can suppress manufacturing cost by arranging the LED modules 10 that can be mass-produced at low cost.

FIG. 10A is a diagram illustrating a whole surface modulation type backlight device, FIG. 10B is a region-based modulation type backlight device, and FIG. 10C is a diagram illustrating a backlight device according to the present embodiment.
The full-modulation type backlight device arranges LEDs, which are light sources, at the end, and modulates brightness over the entire screen. The full-modulation type backlight device is easily thinned because an LED is installed at an end portion, and is used for a small liquid crystal display device such as a mobile phone or an in-vehicle display.

The area-specific modulation type backlight device arranges LEDs over the entire screen (two-dimensional) and modulates the brightness of the LEDs for each area of the screen. The modulation type backlight device by area can finely modulate the brightness of the LED for each area of the screen, so it has a higher contrast improvement effect than the full modulation type, and is used for large liquid crystal display devices such as TVs. Is done.

On the other hand, the backlight device 1 of the present embodiment is a region modulation type and is configured such that the LED module 10 on which a plurality of LEDs are mounted is detachable. For this reason, the backlight device 1 of the present embodiment has a higher contrast improvement effect than the conventional full modulation type, and can further improve the yield compared to the conventional area modulation type. Furthermore, the backlight device 1 has a thickness of 5 mm or less due to the two-dimensional arrangement of the LED modules 10 described in FIGS. 3 to 9, and is thinner than the conventional one.

Further, since the LED module 10 can release the heat generated by the LED 22 to the aluminum base substrate 13 through the electrode aluminum piece 23, the durability of the LED 22 can be improved. *

The backlight device 1 configured as described above is applied to a liquid crystal display device having the following configuration.
FIG. 11 is a block diagram showing a functional configuration of a liquid crystal display device 50 using the backlight device 1.

The liquid crystal display device 50 includes a moving image decoding unit 51 that decodes input moving image data, a maximum luminance detecting unit 52 that detects the maximum luminance for each predetermined pixel, and a frame buffer 53 that temporarily stores the image data. The liquid crystal panel driving unit 54 that drives the liquid crystal panel 55 based on the image data stored in the frame buffer 53, the liquid crystal panel 55 that displays an image, the backlight driving unit 60 that drives the backlight device 1, and the liquid crystal panel And a backlight device 1 that irradiates light to 55. Although not explicitly shown in FIG. 11, the liquid crystal panel 55 and the backlight device 1 are synchronized.

FIG. 12 is a diagram simply showing the LED module 10 (FIG. 3) in which the LEDs 22 are arranged. Here, the LEDs 22 are displayed as circles. The LED 22 in the row direction is connected by a row line ROW, and the LED 22 in the column direction is connected by a column line COL.

FIG. 13 is a diagram schematically showing the backlight device 1 in which the LED modules 10 are arranged. Hereinafter, in the backlight device 1, as shown in the figure, the column line COL is expressed as COL0, COL1, COL2,... In order from the left to the right, and the row line ROW is in order from the top to the bottom. Indicated as ROW1, ROW2,. The luminance of the LED 22 can be changed by changing the voltage of the capacitor C described later. Note that the voltage of the capacitor C on the same row line ROW is changed (updated) at once.

FIG. 14 is a diagram showing 64 pixels irradiated with light to one LED 22. Each pixel of the liquid crystal panel 55 has higher density and higher resolution than each LED 22 of the backlight device 1. Therefore, one LED 22 irradiates a plurality of (for example, 64 (= 8 rows and 8 columns)) pixels of the liquid crystal panel 55 with light. Note that the number of pixels irradiated with light from one LED 22 is not limited to 64, and may be any other number.

(Circuit configuration of LED module 10)
FIG. 15 is a diagram illustrating a detailed circuit configuration of the LED module 10.
As shown in FIG. 15, the LED module 10 has three LEDs 22 arranged in the row direction and the column direction, three column lines COL1 to COL3 wired in the vertical direction, and a horizontal wiring. Three row lines ROW1 to ROW3, field effect transistors (FETs) 26 and 27, which are switching elements, and a capacitor C in which charges corresponding to the luminance of the LED 22 are stored.

Column lines COL1 to COL3 are analog signal lines through which signals corresponding to the luminance of the LED 22 are transmitted, and are connected to the control circuit 12 shown in FIG. The row lines ROW1 to ROW3 are digital signal lines through which signals specifying columns to be scanned are transmitted, and are connected to the control circuit 11 shown in FIG. When the column lines COL1 to COL3 and the row lines ROW1 to ROW3 are driven, the LED 22 emits light with controlled luminance.

(Wiring configuration of LED 22)
Next, the wiring configuration of the LED 22 driven by the row line ROW1 and the column line COL1 will be described. In addition, although detailed description is abbreviate | omitted, other LED22 is wired similarly.

The power supply voltage VCC is applied to the anode of the LED 22 via the resistor R. The cathode of the LED 22 is connected to the drain of a field effect transistor (FET) 26. The source of the FET 26 is grounded. The gate of the FET 26 is grounded via a capacitor C and is connected to the source of the FET 27. The gate of the FET 27 is connected to the row line ROW1, and the drain of the FET 27 is connected to the column line COL1.

(LED22 drive control)
In the LED module 10 configured as described above, the LED 22 is driven as follows. Here, the LED 22 (the upper left LED 22 in FIG. 15) driven by the column line COL1 and the row line ROW1 will be described.

First, a voltage (analog signal) corresponding to the luminance of the LED 22 is applied to the column line COL1.
Next, the row line ROW1 becomes H level (logic 1). As a result, the FET 27 is turned on, charges are accumulated from the row line ROW1 to the capacitor C, and a predetermined voltage is applied to the capacitor C.

When the row line ROW1 becomes L level (logic 0), the FET 27 is turned off and the capacitor C is disconnected from the column line COL1. For this reason, even if the voltage of the row line ROW1 subsequently fluctuates, the voltage of the capacitor C is held for a certain period. Since the FET 26 causes a current corresponding to the voltage of the capacitor C to flow from the gate to the drain, the luminance of the LED 22 is controlled according to the voltage of the capacitor C.

Therefore, for example, the voltage values of the column lines COL0, COL1, COL2,... Are sequentially set to V0, V1, V2,..., And then the voltage value of the row line ROW0 is changed from the L level to the H level and from the H level. When set to the L level, the voltage values of the capacitors C corresponding to the row line ROW0 are collectively set to V0, V1, V2,. As a result, the luminance of each LED 22 corresponding to the row line ROW0 is changed at once.

Then, the voltage may be updated in the order of the row lines ROW1, ROW2, ROW3,..., Or the voltage may be updated in the order of the row lines ROW1, ROW3, ROW2, ROW4.

In FIG. 15, the column line COL1 controls the luminance of the LED 22 and the row line ROW1 selects the LED 22 (row) that should emit light, but the row line ROW1 controls the luminance of the LED 22 and the column line COL1 emits light. You may make it the structure which selects LED22 (row) which should be selected.

(Operation of the liquid crystal display device 50)
The liquid crystal display device 50 configured as described above operates as follows.
The moving picture decoding unit 51 shown in FIG. 11 decodes input moving picture image data. The maximum luminance detection unit 52 detects the maximum luminance from 64 pixels of the image data decoded by the moving image decoding unit 51.

FIG. 16 is a diagram for explaining the operation of the maximum luminance detection unit 52.
The maximum luminance detection unit 52 has a storage area for storing integer arrays (luminance levels) for the number of LEDs 22 on the internal RAM. The maximum brightness detection unit 52 detects the maximum brightness for every 64 pixels, and stores the maximum brightness in the storage area. That is, when the luminances Y1, Y2,... That are pixel rows are input, the maximum luminance detection unit 52 compares the input luminance and the luminance stored in the storage area, and stores the input luminance. If it is greater than the input brightness, the input brightness is stored (updated).

Specifically, the maximum brightness detection unit 52 detects the maximum brightness Y from the brightness Y1, Y2,..., Y64 for each of the 64 pixels, and stores the maximum brightness Y in the storage area 1. Similarly, the maximum brightness detection unit 52 detects the maximum brightness Y from the brightness Y65, Y66,..., Y128 for the next 64 pixels, and stores the maximum brightness Y in the storage area 2. Then, the maximum luminance detection unit 52 outputs the luminance Y1, Y2,... Of each pixel as it is to the frame buffer 53, and backlights for the respective luminances stored in the

storage areas

1, 2,. Output to the drive unit 60.

As a result, when one frame is completed,

storage areas

1, 2. The maximum brightness of each LED 22 is stored in... And this brightness is output to the backlight drive unit 60. At the start of frame scanning, the brightness of the storage area is initialized to zero.

As shown in FIG. 11, the backlight driving unit 60 includes a row driving unit 61 that drives the row line ROW of the backlight device 1, a column driving unit 62 that drives the column line COL of the backlight device 1, and linear correction. A linear correction table 63, a D / A converter 64 for converting a digital signal into an analog signal, and a plurality of sample hold (S / H) circuits 65.

The row driving unit 61 drives the control circuit 12 (column line COL) of the backlight device 1 based on the maximum luminance and the driving timing detected by the maximum luminance detecting unit 52.

The column driving unit 62 refers to the linear correction table 63, converts the maximum luminance output from the maximum luminance detecting unit 52 into a voltage of a digital signal, and outputs it to the D / A converting unit 64. Here, since the relationship between luminance and voltage is not linear, it is necessary to define the relationship between luminance and voltage in advance. Therefore, the linear correction table 63 stores table data in which the relationship between luminance and voltage is defined in advance. Based on this table data, the column driving unit 62 reads a voltage corresponding to the maximum luminance and outputs the read voltage.

The D / A conversion unit 64 converts the digital signal (voltage value) output from the column driving unit 62 into an analog signal (voltage value), and outputs the converted voltage to each S / H circuit 65. At this time, the D / A converter 64 continuously outputs a voltage for driving each column line COL of the backlight device 1 in time series.

The number of S / H circuits 65 corresponding to the number of column lines COL of the backlight device 1 is provided. When each S / H circuit 65 drives the corresponding column line COL, each S / H circuit 65 holds (holds) the voltage output from the D / A converter 64 at a unique timing, and the held voltage is stored in the corresponding column. Output to the line COL (control circuit 11).

Here, the D / A conversion unit is expensive, and if a dedicated D / A conversion unit is provided for each column line COL of the backlight device 1, the cost is increased. Therefore, the D / A converter 64 outputs the voltage of each column line COL in time series, and the S / H circuit 65 corresponding to each column line COL outputs the voltage from the D / A converter 64 at an appropriate timing. Hold and output. As a result, the column line COL can be driven without providing a dedicated D / A converter 64 for each column line COL.

As described above, the backlight device 1 detects the maximum luminance from a plurality of pixels corresponding to one LED 22 and drives the LED 22 so as to achieve this maximum luminance. Thereby, the backlight device 1 can irradiate the liquid crystal panel 55 with the optimum brightness according to the luminance.

The conventional backlight device has a low average brightness on the entire screen when there are multiple high-luminance spots in the overall dark screen, for example, when stars shine in the dark night sky. There was a problem that the whole thing became dark and the brightness of the stars was insufficient.
On the other hand, the backlight device 1 according to the present embodiment controls the brightness of the LEDs 22 so as to obtain the maximum brightness of a plurality of corresponding pixels. It becomes possible to display a beautiful starry sky.

In addition, the backlight device 1 includes S / H circuits 65 corresponding to the respective column lines COL, and each S / H circuit 65 samples and holds the voltage of each column line COL, so that each column line COL has a corresponding value. There is no need to provide a dedicated D / A converter 64, and the LED 22 can be driven with an inexpensive circuit configuration.

The maximum brightness detection unit 52 detects the maximum brightness from the 64 pixels. For example, 64 pixels having a brightness level equal to or higher than a predetermined value (for example, 95% or more of the upper limit value). If there is, it is possible to detect not only the maximum luminance but also any luminance that is a predetermined value or more. This predetermined value is not limited to 95% or more, and can be appropriately changed depending on the environment (brightness) of the liquid crystal display device 50.

The above-described backlight device 1 employs an analog system that controls the brightness of the LED 22 in accordance with the level of the analog signal. In addition, a digital signal system, for example, controls the brightness of the LED 22 in accordance with the duty ratio of the digital signal. PWM (Pulse Width Modulation) control may be employed. Thereby, the backlight apparatus 1 should just energize LED22 only for the required time, and can suppress power consumption.

The present invention is not limited to the backlight device of the above embodiment, and can be applied as a general lighting device as shown in the second embodiment.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected about the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.
The illumination device according to the second embodiment is configured in substantially the same manner as the backlight device 1 shown in FIG. 1, but is installed indoors or outdoors unlike the first embodiment. Hereinafter, in the present embodiment, differences from the first embodiment will be mainly described.

The lighting device according to the second embodiment is configured as follows so that even when one LED module 10 is damaged, the power supply voltage is continuously supplied to the LED module 10 adjacent to the damaged LED module 10. The LED module 10 is included.

FIG. 17 is a circuit diagram of the LED module 10 of the second embodiment. The LED module 10 of the second embodiment is configured in substantially the same way as in FIG. 15, and further includes a row direction voltage supply line V1 and a column direction voltage supply line V2. The row direction voltage supply line V <b> 1 and the column direction voltage supply line V <b> 2 are connected inside the LED module 10. Specifically, the horizontal power supply line V1 and the column power supply line V2 are provided in a multilayer substrate 26 of FIGS. 19 and 22 described later.

The row direction voltage supply line V1 is connected from one end side (interface internal terminal 25) in the row direction of the LED module 10 to the other end side (interface internal terminal 25) in the row direction. The column direction voltage supply line V2 is connected from one end side (interface internal terminal 25) in the column direction of the LED module 10 to the other end side (interface internal terminal 25) in the column direction.

One end side (the side not connected to the LED 22) of each resistor R in the LED module 10 is connected to the column direction voltage supply line V2. For this reason, the voltage VCC is applied to each resistor R in the LED module 10. Note that one end of each resistor R may be connected to the row direction voltage supply line V1 instead of the column direction voltage supply line V2.

Therefore, when the power supply voltage VCC is supplied from the adjacent LED module 10, the LED module 10 applies the power supply voltage VCC to each resistor R in the LED module 10. Further, the LED module 10 supplies the power supply voltage VCC to each of the other three adjacent LED modules 10.

In addition, the illumination device of the present embodiment has a function of not only illuminating the object but also photographing the object and wirelessly communicating photographing information. The illuminating device of the present embodiment has a sensor module 70 in order to realize a function of photographing an object.
FIG. 18 is a perspective view of the sensor module 70. FIG. 19 is a cross-sectional view of the sensor module 70. The sensor module 70 has the same size as the LED module 10 and can be attached to and detached from the aluminum base substrate 13 in the same manner as the LED module 10. For this reason, in this embodiment, the one or more LED modules 10 provided in the illumination device according to the first embodiment are replaced with the sensor module 70.

The sensor module 70 is configured in substantially the same manner as in FIG. 9, but has a CMOS sensor 71 and a hood 72 as shown in FIG. 19 instead of the LED 22 shown in FIG. 9.
The CMOS sensor 71 is connected to the electrode aluminum piece 23 via the macro bump 22a. For this reason, the heat generated by the CMOS sensor 71 is released to the outside through the micro bumps 22a, the electrode aluminum pieces 23, and the aluminum base substrate 13.
The hood 72 is disposed on the organic substrate 21 so as to surround the end portion of the CMOS sensor 71. Thereby, the light from the LED module 10 around the sensor module 70 does not enter the CMOS sensor 71.

FIG. 20 is a circuit diagram of the sensor module 70. The sensor module 70 includes a CMOS sensor 71, a row direction voltage supply line V3, and a column direction voltage supply line V4. The row direction voltage supply line V3 and the column direction voltage supply line V4 are connected inside the sensor module 70.

The row direction voltage supply line V3 is connected from one end side (interface internal terminal 25) in the row direction of the sensor module 70 to the other end side (interface internal terminal 25) in the row direction. The column direction voltage supply line V4 is connected from one end side (interface internal terminal 25) in the column direction of the sensor module 70 to the other end side (interface internal terminal 25) in the column direction.
The CMOS sensor 71 is connected to the column direction power supply line V4. The CMOS sensor 71 may be connected to the row direction voltage supply line V3 instead of the column direction voltage supply line V4. The CMOS sensor 71 generates an image signal corresponding to the light from the object, and outputs the image signal via the interface internal terminal 25.

Therefore, when the power supply voltage VCC is supplied from the adjacent LED module 10, the sensor module 70 applies the power supply voltage VCC to the CMOS sensor 71 in the sensor module 70. Further, the sensor module 70 supplies the power supply voltage VCC to each of the other three adjacent LED modules 10.

Further, the lighting device of the present embodiment includes a wireless LAN module 80 in order to realize a function of performing wireless communication.
FIG. 21 is a perspective view of the wireless LAN module 80. FIG. 22 is a cross-sectional view of the wireless LAN module 80. The wireless LAN module 80 has the same size as the LED module 10 and can be attached to and detached from the aluminum base substrate 13 in the same manner as the LED module 10. For this reason, in this embodiment, the one or more LED modules 10 provided in the lighting device according to the first embodiment are replaced with the wireless LAN module 80.

The wireless LAN module 80 is configured in substantially the same manner as in FIG. 9, but has a wireless LAN chip 81 as shown in FIG. 22 instead of the LED 22 shown in FIG.
The wireless LAN chip 81 is connected to the electrode aluminum piece 23 through the macro bump 22a. Therefore, the heat generated in the wireless LAN chip 81 is released to the outside through the micro bumps 22a, the electrode aluminum pieces 23, and the aluminum base substrate 13.

FIG. 23 is a circuit diagram of the wireless LAN module 80. The wireless LAN module 80 includes a wireless LAN chip 81, a row direction voltage supply line V5, and a column direction voltage supply line V6. The row direction voltage supply line V5 and the column direction voltage supply line V6 are connected inside the wireless LAN module 80.

The row direction voltage supply line V5 is connected from one end side (interface internal terminal 25) in the row direction of the wireless LAN module 80 to the other end side (interface internal terminal 25) in the row direction. The column direction voltage supply line V6 is connected from one end side (interface internal terminal 25) in the column direction of the wireless LAN module 80 to the other end side (interface internal terminal 25) in the column direction.
The wireless LAN chip 81 is connected to the column direction power supply line V6. The wireless LAN chip 81 may be connected to the row direction voltage supply line V5 instead of the column direction voltage supply line V6. When the image signal from the CMOS sensor 71 is input, the wireless LAN chip 81 performs wireless communication with the receiver.

As described above, in the lighting device of the second embodiment, the plurality of LED modules 10 having the row direction voltage supply line V1 and the column direction voltage supply line V2 connected to each other are arranged in the row direction and the column direction. Yes. When the power supply voltage VCC is supplied from the adjacent LED module 10, each LED module 10 supplies the power supply voltage VCC to the other three adjacent LED modules 10.

Therefore, even when an arbitrary LED module 10 is damaged, the LED module 10 to which the power supply voltage VCC is supplied from the damaged LED module 10 is supplied with the power supply voltage VCC from another adjacent LED module 10. . That is, even when any LED module 10 is damaged, it is possible to avoid the supply of the power supply voltage VCC to other adjacent LED modules 10.

In addition to the LED module 10, the illumination device according to the second embodiment includes the sensor module 70 and the wireless LAN module 80, and thus functions as a monitoring camera that is not conspicuous from the outside.
The lighting device may include a human sensor, a magnetic sensor, a temperature sensor, a vibration sensor, a smoke sensor, an electromagnetic wave sensor, an earthquake sensor, and the like instead of the sensor module 70. At this time, the wireless LAN module 80 may wirelessly transmit the signal detected by any of the sensors described above to another device.

Note that the wireless LAN module 80 may have a function of receiving a signal wirelessly transmitted from a predetermined wireless LAN module and wirelessly transmitting the signal to another wireless LAN module. Thereby, the said illuminating device also has a role as a small radio base station. The wireless LAN module 80 only needs to have a wireless communication function, and may be, for example, a Wi-Fi (registered trademark), a millimeter wave communication device, or a PHS radio wave relay chip.

Furthermore, since the illumination device of the second embodiment is configured as described above, the thickness is, for example, 5 mm or less, and is thinner than the conventional one. For this reason, the said illuminating device can be used in the state embedded, for example in the indoor ceiling, the indoor outdoor wall, etc. Furthermore, when the lighting device is embedded in the outer wall of a building, an LED module may be used instead of the outer wall tile. In this case, the building itself functions as a lighting device, and a building such as an adjacent building can be illuminated. The present invention can also be applied to an illumination device used in a projection device.

In the embodiment described above, the LED 22 is connected to the wiring 28 or the electrode aluminum piece 23 via the micro bump 22a, but may be connected by wire bonding.

DESCRIPTION OF SYMBOLS 1 Backlight apparatus 10 LED module 13 Aluminum base substrate 22 LED
23 Electrode Aluminum Piece 50 Liquid Crystal Display Device 52 Maximum Brightness Detection Unit 55 Liquid Crystal Panel 60 Backlight Drive Unit 70 Sensor Module 80 Wireless LAN Module

Claims

A metal base substrate formed in a planar shape;
An organic substrate, a plurality of LEDs arranged on the organic substrate, and provided corresponding to each LED, heat from the LED is conducted, and electrically from one electrode of the LED through a switch element A metal member that passes through the width direction of the organic substrate from the LED mounting surface of the organic substrate and is exposed from the opposite surface, an LED control signal terminal provided on the edge side of the organic substrate, and the organic A voltage supply terminal provided on an edge side of the substrate, arranged in a row direction and a column direction in a detachable manner on the metal base substrate, and between adjacent ones in the row direction and the column direction A plurality of LED modules to which adjacent LED control signal terminals and adjacent power supply terminals are respectively connected;
A driving unit for driving the LEDs arranged on the metal base substrate;
A lighting device comprising:
A luminance detecting unit for detecting a maximum luminance or a luminance of a predetermined value or more from a plurality of pixel signals corresponding to the LED;
The lighting device according to claim 1, wherein the driving unit drives the LED so that the luminance detected by the luminance detection unit is obtained.
A converter for converting the voltage of each control line for driving the LED in the row direction or the column direction from a digital signal to an analog signal;
A plurality of sample and hold circuits that are provided for each control line, hold the voltages output from the conversion unit at independent predetermined timings, and output to the corresponding control lines;
The illumination device according to claim 1, further comprising:
The LED module includes a first voltage supply line connecting between two voltage supply terminals opposed in the row direction, and a connection between two voltage supply terminals opposed in the column direction and the first voltage supply line. The lighting device according to claim 1, further comprising a connected second voltage supply line.
The lighting device according to claim 1, further comprising a wireless transmission module that relays a wirelessly transmitted signal.
The illuminating device according to claim 1, further comprising: a sensor module including an image sensor that images a subject; and a wireless transmission module including a wireless transmission unit that wirelessly transmits a signal output from the image sensor.
A liquid crystal panel in which a plurality of pixels are arranged;
The illumination device according to claim 1, which irradiates light to the liquid crystal panel;
A liquid crystal display device.